JP2007235543A - Optical disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk drive capable of displaying a previous caption on resume reproduction, if there is no caption data in a resume stopped position. <P>SOLUTION: If there is no caption data in a resume stopped position t1 and a caption is not displayed; a caption address of a position t2, where a previous caption data immediately before is recorded, is searched when resume reproduction is carried out. The caption address is established as a caption display starting address, and a caption according to a caption data from the caption display starting address is displayed on a display device. For example, after a user has viewed a movie with captions and conducted resume stop on the way, the previous caption is displayed automatically without conducting a quick return operation, even if he/she forgets the content until the resume stop when he/she starts resume reproduction after some time elapses. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus that reproduces information recorded on an optical disc or records / reproduces information on an optical disc, and more particularly, resumes an optical disc on which information including video data, audio data, and caption data is recorded. It relates to playback processing.

Conventionally, in an optical disc apparatus such as a DVD player or a DVD recorder capable of reproducing information including video data, audio data, and caption data recorded on a DVD (digital versatile disc) as an optical disc, the DVD When playing back the information recorded on the screen, when the user stops the playback halfway by pressing the stop key on the remote control etc., the so-called resume stop address information indicating the position of the resume stop and the display of subtitles Resume stop related information including subtitle management information for managing the start position and display time is stored in the flash memory, and then stored in the flash memory when the user performs a playback operation by pressing a playback key such as a remote controller. Resume stop address information and subtitle management information Preparative read, to start the so-called resume reproduction start playback from the stopped position.
JP 2005-303791 A JP 2004-118980 A

  However, when resume playback is started, video and audio appear, but subtitles may not appear. Such a case will be described with reference to FIG. FIG. 6 is a data configuration diagram of video / audio / subtitles for explaining processing during resume reproduction in a conventional optical disc apparatus.

  In FIG. 6, V indicates a video pack (V_PCK), A indicates an audio pack (A_PCK), and S indicates a sub-picture pack (SP_PCK). For example, when the resume is stopped at the position t1, and then resume playback is performed from the position t1, the subtitle display time from the position t2 that is the display start position of the previous subtitle has passed based on the subtitle management information. Since the video is displayed on the display device at the position t1, but the subtitle is not displayed and the reproduction reaches the position t3, the sub-picture pack (SP_PCK) is determined. The subtitles based on the subtitle data are displayed.

  As described above, in the conventional optical disc device, when resume playback is performed at a position that is not a subtitle display period, the subtitle is not displayed for a while until the next subtitle data is present, so the user is watching a movie with subtitles, for example. If you have forgotten the content from when you resumed the playback in the middle until you resume playback when you have resumed playback for a while, the previous subtitle is displayed to remind you of the content. There is a problem that the operation to put out the previous subtitle is troublesome because it is necessary to perform fast rewind until it is done.

  In the prior art of Patent Document 1, when playback is started from a user-specified time position, it is determined whether the user-specified time position is in a caption display period. An address corresponding to the display start time of the caption data is calculated, the address is accessed once, and the corresponding caption data is read. Then, only the caption data is decoded (decoded), and when the decoding is completed, the jump to the address corresponding to the previous user-specified time position is performed again, the video data is read and decoded, and the previously decoded caption data and Synchronize and start playback.

  However, this prior art calculates the address corresponding to the display start time of the subtitle data if the user-specified time position is during the subtitle display period, accesses the address once, and displays the corresponding subtitle data. Although reading and subtitles can be displayed, subtitles cannot be displayed unless the user-specified time position is during the subtitle display period, and thus the above-described problems cannot be solved.

  In the prior art disclosed in Patent Document 2, when the sub-picture control unit detects that the sub-picture unit corresponding to the playback start time is not stored in the storage unit, the host microcomputer is predetermined from the playback start time when the host microcomputer tries to start playback. The sub-picture before the time is read and the subtitles are displayed. At the playback start time, playback starts when the special playback operation such as scan operation, slow playback or double speed playback is shifted to the normal playback operation. Even if there is no subtitle at the time of resume playback, the subtitle is not displayed.

  The present invention has been made to solve the above-described problems, and provides an optical disc device capable of displaying a previous subtitle when resume playback is performed when there is no subtitle data at a position where resume is stopped. For the purpose.

  In order to achieve the above object, the invention of claim 1, when resume is stopped when information on an optical disc on which information including video data, audio data, and subtitle data is recorded is resumed. Resume stop related information storage means for storing resume stop related information including information and subtitle management information in a memory, and when a resume playback command is received after the resume is stopped, resume stop address information and subtitle management from the memory Resume stop related information acquisition means for acquiring resume stop related information including information, subtitle display period determination means for determining whether or not the resume playback state is in a subtitle display period, and the subtitle display period When it is determined that the subtitle display is in progress, the subtitle display start address is searched and subtitle display processing is performed. When it is determined that the subtitle display period is not in effect, subtitle address search means for searching for a subtitle address in which the previous subtitle data is recorded, and the searched subtitle address is set as a subtitle display start address. Subtitle data reading means for reading out the previous subtitle data from a display start address, subtitle decoding control means for controlling the read out previous subtitle data by a decoder, and the previous subtitle The subtitle display time of the previous subtitle data, the subtitle address where the subtitle data of the next subtitle is displayed, the resume address indicating the resume playback position, Subtitle display time calculation means for calculating based on the playback time between the memory and resume stop address information from the memory. Video / audio decoding control means for performing control to read out video data and audio data at an actual resume reproduction position corresponding to an address and decode the decoded data by a decoder, the decoded video data, and the previous subtitle data decoded An optical disc apparatus comprising a system controller having a display control means for displaying the video, audio, and subtitles on a display device is provided.

  In this configuration, when a stop key is pressed while reproduction is being performed on an optical disc on which information including video data, audio data, and caption data is recorded, the resume stop related information storage unit performs a resume stop process. And resume stop related information including resume stop address information and subtitle management information is stored in the memory. When the playback key is pressed while the resume is stopped as described above, the resume stop related information acquisition unit receives the resume playback command and acquires the resume stop address information and the caption management information from the memory.

  Next, the subtitle display period determining means determines whether or not the resume playback state is in the subtitle display period. If it is determined that the subtitle display period is in the subtitle display period, the subtitle display start address is searched. Then, the subtitle display process is performed, but when it is determined that the subtitle display period is not in effect, the subtitle address search means searches for a subtitle address in which the previous subtitle data is recorded.

  The subtitle data reading means sets the searched subtitle address as a subtitle display start address, and reads the previous subtitle data from the subtitle display start address. The subtitle decoding control means causes the sub-picture decoder to decode the previous subtitle data read from the subtitle display start address, and the subtitle display time calculating means includes the subtitle in which the previous subtitle is displayed next. The subtitle display time of the previous subtitle data is based on the playback time between the subtitle address where the subtitle data of the next subtitle is displayed and the resume address indicating the resume playback position. To calculate.

  Next, the video / audio decoding control means reads the video data and audio data at the actual resume reproduction position corresponding to the address indicated by the resume stop address information from the memory, decodes the video data by the video decoder, and converts the audio data to Decode with audio decoder. The display control means synchronizes the decoded video data with the decoded subtitle data and causes the display device to display video / audio / subtitles based on the video data / audio data / subtitle data. . Since such processing decodes the video data and audio data at the actual resume playback position almost simultaneously with the display of the subtitles, it seems that the video / audio / subtitles are output at the same time when the resume playback is started.

  According to this configuration, when there is no subtitle data at the position where the resume is stopped, the previous subtitle can be displayed when the resume is played back, so that the user can stop the resume while watching a movie with subtitles, for example. Even if you have forgotten the content of the resume playback when it resumes after a while, the previous subtitle is automatically displayed without rewinding. Is done. Therefore, the user does not need to perform a troublesome operation of quickly returning to the position where the previous subtitle is displayed in order to recall the content before the resume is stopped, and the usability is improved.

  According to the second aspect of the present invention, when there is no subtitle data at the position where the resume is stopped, the subtitle address where the previous subtitle data is recorded is searched when the resume reproduction is performed, and this subtitle address is set as the subtitle display start address. Also provided is an optical disc apparatus comprising a system controller for controlling the display device to display subtitles based on subtitle data from the subtitle display start address.

  In this configuration, when there is no subtitle data at the position where the resume is stopped, the subtitle address where the previous subtitle data is recorded is searched when resuming playback, and this subtitle address is set as the subtitle display start address, Subtitles based on subtitle data from the subtitle display start address are displayed on the display device.

  According to this configuration, when there is no subtitle data at the position where the resume is stopped, the previous subtitle can be displayed when the resume is played back, so that the user can stop the resume while watching a movie with subtitles, for example. Even if you have forgotten the content of the resume playback when it resumes after a while, the previous subtitle is automatically displayed without rewinding. Is done. Therefore, the user does not need to perform a troublesome operation of quickly returning to the position where the previous subtitle is displayed in order to recall the content before the resume is stopped, and the usability is improved.

  According to a third aspect of the present invention, in the second aspect of the invention, when the system controller is resumed when reproducing information on an optical disc on which information including video data, audio data, and subtitle data is recorded. Resume stop related information storage means for storing resume stop related information including resume stop address information and subtitle management information in a memory, and when a resume playback command is received after the resume is stopped, a resume stop address is received from the memory Resume stop related information acquisition means for acquiring resume stop related information including information and subtitle management information, subtitle display period determination means for determining whether or not the state when resume playback is in the subtitle display period, When it is determined that the subtitle display period is in progress, the subtitle display start address is detected. Subtitle display processing is performed. When it is determined that the subtitle display period is not in effect, subtitle address search means for searching for a subtitle address in which the previous subtitle data is recorded, and the searched subtitle address A subtitle data reading unit that sets the subtitle display start address and reads out the previous subtitle data from the subtitle display start address, and performs subtitle decoding that controls the decoder to decode the read out subtitle data. Control means, subtitle display time calculating means for calculating the display time of the subtitle by the previous subtitle data so that the previous subtitle does not overlap with the next displayed subtitle, and resume stop from the memory The video data and audio data at the actual resume playback position corresponding to the address indicated by the address information are read and decoded by the decoder. Video / audio decoding control means for controlling the video data, display control means for synchronizing the decoded video data and the decoded previous caption data, and displaying the video / audio / caption on the display device; Have

  Therefore, the system controller includes a resume stop related information storage process, a resume stop related information acquisition process, a caption display period determination process, a caption address search process, a caption data read process, a caption decode control process, a caption display time calculation process, a video / audio The decoding control process and the display control process can be realized, so that even when there is no caption data at the resumed stop position and no caption is displayed, it is possible to display the caption during resume playback.

  According to a fourth aspect of the present invention, in the third aspect of the invention, the subtitle display time calculating means is configured to display a subtitle based on the previous subtitle data so that the previous subtitle does not overlap with the next subtitle displayed. Since the display time is calculated based on the reproduction time between the subtitle address where the subtitle data of the next subtitle to be displayed and the resume address indicating the resume reproduction position is displayed, the display of the previous subtitle is The subtitles can be deleted before the subtitles are displayed, thereby preventing the previous subtitle from overlapping with the next subtitle displayed.

  As described above, according to the present invention, when a resume is stopped while reproducing information on an optical disc on which information including video data, audio data, and subtitle data is recorded, resume stop address information and subtitle management information Resume stop related information storage means for storing the resume stop related information including the memory, and when the resume playback command is received after the resume stop, the resume including the resume stop address information and the subtitle management information from the memory Resume stop related information acquiring means for acquiring stop related information, subtitle display period determining means for determining whether or not the resume playback state is in a subtitle display period, and determining that it is in the subtitle display period When the subtitle display start address is searched, the subtitle display processing is performed by searching for the subtitle display start address. When it is determined that the subtitle data is not in the middle, subtitle address search means for searching for the subtitle address in which the previous subtitle data is recorded, and the searched subtitle address is set as a subtitle display start address. Subtitle data reading means for reading the previous subtitle data, subtitle decoding control means for controlling the read previous subtitle data to be decoded by a decoder, and the previous subtitle displayed next The display time of the subtitle by the previous subtitle data so that it does not overlap with the subtitle to be reproduced, playback between the subtitle address having the subtitle data of the next subtitle displayed and the resume address indicating the resume reproduction position Corresponding to the address indicated by the subtitle display time calculation means for calculating based on the time and the resume stop address information from the memory The audio / video decoding control means for controlling the video data and audio data at the actual resume playback position to be read out and decoded by the decoder, and the decoded video data and the decoded subtitle data are synchronized. In addition, a system controller having display control means for displaying video, audio, and subtitles on the display device is provided, so that when there is no subtitle data at the resumed position, the previous subtitle is displayed when resume playback is performed. As a result, for example, after a user is watching a movie with subtitles and resumes halfway, the user forgets the content until the resume is stopped after a while. The previous subtitle is automatically displayed without rewinding. . Therefore, the user does not need to perform a troublesome operation of quickly returning to the position where the previous subtitle is displayed in order to recall the content before the resume is stopped, and the usability is improved.

  Also, according to the present invention, when there is no subtitle data at the position where the resume is stopped, the subtitle address where the previous subtitle data is recorded is searched when the resume reproduction is performed, and this subtitle address is used as the subtitle display start address. And a system controller that controls the display device to display subtitles based on subtitle data from the subtitle display start address.If there is no subtitle data at the resumed position, the previous subtitle is displayed when resume playback is performed. For example, after a user is watching a movie with subtitles and pauses on the way, the content from when the user resumes to resume when a resume playback starts after a while. Even if you have forgotten, the previous subtitle is automatically displayed without rewinding It is. Therefore, the user does not need to perform a troublesome operation of quickly returning to the position where the previous subtitle is displayed in order to recall the content before the resume is stopped, and the usability is improved.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration of a DVD recorder as an optical disk apparatus according to an embodiment of the present invention. Here, a DVD recorder that records / reproduces information on / from an optical disk such as a DVD will be described as an optical disk device. However, the resume reproduction process can also be applied to a DVD player that reproduces information recorded on an optical disk. Needless to say.

  This DVD recorder includes a system controller 22 that controls the entire apparatus, a spindle motor 5 that rotates the optical disc 1, an optical pickup 2 that optically writes / reads information to / from the optical disc 1, and the optical pickup 2. The sled 3 for moving the optical disk 1 in the radial direction and the spindle motor 5 and the sled 3 are driven through the motor drive circuit 34 in accordance with an instruction from the system controller 22 and the objective lens ( And a servo control unit 4 for performing control to move the focal position of the laser beam in the vertical direction and the horizontal direction with respect to the recording surface of the optical disc 1 by moving the laser beam.

  The DVD recorder also includes an RF amplifier 6 that amplifies an RF signal that is a read signal from the optical pickup 2 during reproduction of the optical disc 1, and an optical disc 1 that converts the RF signal output from the RF amplifier 6 into digital data. The digital signal processing unit 8 stores the data generated by performing the signal demodulation processing and error correction processing according to the data format in the RAM 7 serving as a buffer memory, and outputs from the digital signal processing unit 8 according to an instruction from the system controller 22 A stream separator 9 for separating audio data, sub-picture data (caption data), and video data from the generated data stream.

  The DVD recorder also stores the audio decoder 11 that receives the audio data output from the stream separation unit 9 and performs a predetermined decoding process, and temporarily stores the data for performing the decoding process by the audio decoder 11. The RAM 10, the sub-picture decoder 13 that inputs the sub-picture data output from the stream separation unit 9 and performs a predetermined decoding process, and temporarily stores the data to perform the decoding process by the sub-picture decoder 13 A RAM 12 that receives the video data output from the stream separation unit 9 and performs a decoding process using MPEG or the like, and a RAM 14 that temporarily stores data for the decoding process in the video decoder 15. And.

  The DVD recorder also synthesizes the data output from the video decoder 15 and the data output from the sub-picture decoder 13 in response to an instruction from the system controller 22, and the video processor 17 outputs the video processor 17. For example, the video encoder 18 converts the synthesized data into a video signal for display and displays the image on the display device 20, and converts the data output from the audio decoder 11 into an analog audio signal, for example, via an audio circuit (not shown). And a D / A converter 16 to be supplied to the speaker 19.

  The DVD recorder also has various operation keys such as a recording key for giving a recording instruction to the system controller 22, a reproducing key for giving a reproducing instruction, and a stopping key for giving a recording / reproducing stop instruction. And a main body operation unit (not shown) having fewer operation keys than the operation keys of the remote control 21. The DVD recorder also has a flash ROM 23 as a non-volatile memory in which programs and data for controlling each component of the apparatus and the entire apparatus are stored, and in accordance with the programs and data in the flash ROM 23. A CPU 24 that performs arithmetic processing to control the system controller 22 and a RAM 27 that temporarily stores data necessary for the arithmetic processing of the CPU 24 are provided.

  The DVD recorder also includes a tuner 29 connected to the antenna 28, an analog video / audio signal of a television broadcast selected by the tuner 29, or a television receiver (not shown) or other video / audio output device. An A / D conversion circuit 30 for converting the video / audio signal of the video / audio signal into digital video / audio data, an encoder 31 for encoding the video / audio data by MPEG or the like, and the encoded video / audio data (encoded data) temporarily. A RAM 32 serving as a buffer memory for storing only a fixed amount, an ATAPI (AT Attachment Packet Interface) 33 that is an interface connected to the recording data modulation circuit 25, and an encoded data sent from the ATAPI 33 is modulated for recording on the optical disc 1. Recording data modulation circuit 2 When, and a laser modulation circuit 26 which outputs a laser modulation signal for modulating the laser beam emitted from the optical pickup 2 based on the modulation data modulated by the recording data modulation circuit 25 to the optical pickup 2.

  When the system controller 22 is resumed when playing back information on a DVD on which information including video data, audio data, and caption data is recorded as a characteristic element of the present embodiment, the system controller 22 stops the resume. Resume stop related information storage means 221 for storing resume stop related information including address information and subtitle management information in the flash ROM 23, and when a resume playback command is received after the resume is stopped, resume stop address information from the flash ROM 23 And resume stop related information acquiring means 222 for acquiring resume stop related information including the subtitle management information, and a subtitle display period determining means 223 for determining whether or not the resume playback state is in the subtitle display period Is determined to be during the caption display period. When the subtitle display start address is searched and subtitle display processing is performed, it is determined that the subtitle display period is not in effect, but the subtitle address search means 224 searches for the subtitle address in which the previous subtitle data is recorded. And have.

  Further, the system controller 22 sets the searched subtitle address as a subtitle display start address, subtitle data reading means 225 for reading the previous subtitle data from the subtitle display start address, and the one read out Subtitle decoding control means 226 for controlling the subtitle decoder 13 to decode the previous subtitle data, and the subtitle based on the previous subtitle data so that the previous subtitle does not overlap the next subtitle displayed. Subtitle display time calculating means 227 for calculating the display time of the subtitle based on the reproduction time between the subtitle address having the subtitle data of the next subtitle displayed and the resume address indicating the resume reproduction position; The actual resume playback position corresponding to the address indicated by the resume stop address information of The audio / video decoding control means 228 for controlling the video decoder 15 and the audio decoder 11 to read out the data and audio data and decode them, and the decoded video data and the decoded subtitle data are synchronized. Display control means 229 for displaying video / audio / subtitles on the display device 20.

  FIG. 2 is a diagram showing a data structure recorded on a DVD of the DVD video standard as an optical disk in the present embodiment. In FIG. 2, the video object set (VOBS) includes a plurality of video objects (VOB), that is, (V0B_IDN1), (V0B_IDN2),..., (V0B_IDNi). IDN1, IDN2,..., IDNi indicate identification numbers. Each video object (VOB) is composed of a plurality of cells (Cells). For example, the video object (V0B_IDN1) includes a plurality of cells (C_IDN1), (C_IDN2), ..., (C_IDNj). IDN1, IDN2,..., IDNj indicate identification numbers.

  For example, the cell (C_IDN1) is composed of a plurality of video object units (VOBU). Each video object unit (VOBU) includes a navigation pack (NV_PCK), an audio pack (A_PCK), a video pack (V_PCK), and a sub-picture pack (SP_PCK).

  The navigation pack (NV_PCK) and the audio pack (A_PCK) are composed of, for example, 2048 bytes. For example, a 14-byte pack header, a 24-byte system header, and a 6-byte packet header ( Packet header), 1-byte sub-stream identifier (Sub_stream_id), 979-byte play control information data (PCI data), 6-byte packet header (Packet header), 1-byte sub-stream identifier (Sub_stream_id), and 1017-byte It consists of data search information data (DSI data).

  A play control packet (PCI_PKT) is composed of a 6-byte packet header (Packet header), a 1-byte substream identifier (Sub_stream_id), and 979-byte play control information data (PCI data). A 6-byte packet header (Packet header), a 1-byte substream identifier (Sub_stream_id), and 1017-byte data search information data (DSI data) constitute a data search information packet (DSI_PKT).

  Data search information data (DSI data) composed of 1017 bytes includes 32-byte data search information general information, 148-byte seamless playback information (SMI_PBI), 54-byte seamless angle information (SML_AGLI), and 168-byte video object. It consists of unit search information (VOBU_SRI), 144-byte synchronization information (SYNCI), and 471-byte reserved.

  The 168-byte video object unit search information (VOBU_SRI) is composed of 4-byte video forward information (FWDI Video), a 160-byte data area, and 4-byte video backward information (BWDI Video). . The video forward information (FWDI Video) indicates the start address of the next video object unit (VOBU) in the video stream (navigation pack start address). The video backward information (BWDI Video) indicates the start address of the previous video object unit (VOBU) in the video stream (start address of the navigation pack).

  FIG. 3 is a video / audio / subtitle data configuration diagram for explaining the process of searching for the previous subtitle data (sub-picture pack) during resume playback in the present embodiment.

  In FIG. 3, V indicates a video pack (V_PCK), A indicates an audio pack (A_PCK), and S indicates a sub-picture pack (SP_PCK). For example, when the resume is stopped at the position t1 and the sub-picture pack (SP_PCK) immediately before the position t1 is searched (searched) during the resume playback, the sub-picture pack (SP_PCK) at the position t2 is detected. The subtitle data of the sub-picture pack (SP_PCK) is decoded and the subtitles are displayed on the display device 20.

  The caption display time of the system controller 22 so that the caption display by the caption data at the position t2 does not overlap with the caption display by the caption data of the sub-picture pack (SP_PCK) at the position t3 after resume reproduction from the position t1. The calculation means 227 calculates the position t2 based on the reproduction time between the subtitle address (address t3) where the subtitle data of the next subtitle to be displayed is present and the resume address (address t1) indicating the resume reproduction position. The display time of subtitles based on the subtitle data in is calculated. For example, if the playback time from the position t1 to the position t3 is 8 seconds, the display time of the subtitle data at the position t2 is set within 8 seconds, and the subtitle data display at the position t2 is displayed. There is no overlap with the display of subtitles by subtitle data at the position t3.

  FIG. 4 is a flowchart for explaining processing when the resume is stopped during reproduction in the present embodiment. With reference to this flowchart and FIGS. 1 and 3, the processing when the resume is stopped during reproduction will be described.

  First, when a DVD in which information including video data, audio data, and caption data is recorded is inserted into the DVD recorder (step S1), the DVD is started up by a predetermined mounting process and is ready for playback. Here, when a reproduction key such as the remote controller 21 is pressed (step S2), the system controller 22 performs a reproduction operation on the DVD, and information recorded on the DVD is reproduced (step S3). That is, the video data, audio data, and caption data from the DVD read by the optical pickup 2 are subjected to predetermined processing via the RF amplifier 6 and the digital signal processing unit 8 and then supplied to the stream separation unit 9. The video data is input to the video decoder 15, the audio data is input to the audio decoder 11, and the caption data is input to the sub-picture decoder 13. The decoded video data and subtitle data are subjected to predetermined processing by the video processor 17 and the video encoder 18 and displayed on the display device 20. The decoded audio data is converted into an analog signal by the D / A converter 16, and the analog signal is amplified by an audio circuit (not shown), supplied to the speaker 19, and output as audio.

  When the reproduction is performed on the DVD in this way, if the reproduction is performed to the end and the reproduction is completed (step S4), the system controller 22 stops the reproduction assuming that the reproduction is completed to the end. (Step S8) This processing is finished, but when a stop key such as the remote controller 21 is pressed before the reproduction is finished to the end (Step S5), the resume stop related information storage means 221 of the system controller 22 Stop processing is performed (step S6), and resume stop-related information including resume stop address information and caption management information is stored in the flash ROM 23 (step S7). For example, as shown in FIG. 3, when the resume is stopped at the position t1, the system controller 22 manages the resume stop address information corresponding to the position t1, and the caption management information managing the display start position and display time of the caption. Is stored in the flash ROM 23, and the process ends.

  FIG. 5 is a flowchart for explaining the resume reproduction process in this embodiment. The resume reproduction processing will be described with reference to this flowchart and FIGS.

  When a playback key such as the remote controller 21 is pressed while the resume is stopped (step N1) (step N2), the resume stop related information acquisition unit 222 of the system controller 22 receives the resume playback command (step N3). ) Resume stop address information and subtitle management information are acquired from the flash ROM 23 (step N4).

  Next, the subtitle display period determination means 223 of the system controller 22 determines whether or not the resume playback state is in the subtitle display period (step N5), and is determined to be in the subtitle display period. When the system controller 22 searches for the subtitle display start address (step N6) and performs the subtitle display processing, the subtitle address search means 224 determines that it is not in the subtitle display period. The subtitle address where the subtitle data is recorded is searched (step N7).

  Then, the caption data reading means 225 sets the searched caption address as a caption display start address (step N8), and reads the previous caption data from the caption display start address (step N9). Even if it is determined in step N5 that the subtitle display period is in effect and the subtitle display start address is searched for in step N6, the subtitle data reading means 225 reads subtitle data from the subtitle display start address (step N9). When the subtitle display period is in progress, there is no need to read out the previous subtitle data, and since the subtitle data in the subtitle display period is at the subtitle display start address, it is only necessary to read out the subtitle data from this address. It will be.

  The following processes in Step N10 to Step N13 can be applied to a process for displaying a caption when the caption display period is in effect, but here, as a process characteristic of the present embodiment, it is not in the caption display period. In this case, a process for displaying the previous subtitle will be described.

  The caption decoding control means 226 of the system controller 22 causes the subpicture decoder 13 to decode the immediately preceding caption data read from the caption display start address by the caption data reading means 225 (step N10), and the caption display time calculation means. 227 displays a subtitle display time by the previous subtitle data so that the previous subtitle does not overlap with the next displayed subtitle, and a subtitle address having the subtitle data of the next subtitle displayed. Then, calculation is made based on the reproduction time between the resume address indicating the resume reproduction position (step N11). An example of a method for calculating the caption display time is described in FIG.

  Next, the video / audio decoding control means 228 of the system controller 22 reads the video data and audio data at the actual resume reproduction position corresponding to the address indicated by the resume stop address information from the flash ROM 23, and the video data is read from the video decoder 15. The audio data is decoded by the audio decoder 11 (step N12). Then, the display control means 229 synchronizes the decoded video data and the previous subtitle data thus decoded, and displays video / audio / subtitles based on the video data / audio data / subtitle data to the display device 20. It is displayed (step N13). In the process of step N12, the video data and audio data at the actual resume playback position are decoded almost simultaneously with the display of the subtitles, so that the video / audio / subtitles are output at the same time when the resume playback is started. appear.

  As described above, according to the present embodiment, when there is no subtitle data at the position where resume is stopped, the previous subtitle can be displayed when the resume playback is performed. Even if you are watching and have resumed halfway, if you have forgotten the contents from when you resumed playback until you resume playback, do not perform fast reverse operation. The previous subtitle is automatically displayed. Therefore, the user does not need to perform a troublesome operation of quickly returning to the position where the previous subtitle is displayed in order to recall the content before the resume is stopped, and the usability is improved.

  The present invention can display the previous subtitle if the subtitle is not displayed at the time of resume playback after stopping the resume of the DVD information on which information including video data, audio data, and subtitle data is recorded. This function can be employed in an optical disc apparatus such as a DVD player or a DVD recorder.

It is a block diagram which shows the structure of the DVD recorder as an optical disk apparatus based on one Embodiment of this invention. It is a figure which shows the data structure currently recorded on DVD of the DVD video specification as an optical disk in the said embodiment. FIG. 4 is a data configuration diagram of video / audio / subtitles for explaining processing for searching for previous subtitle data (sub-picture pack) during resume reproduction in the embodiment. 4 is a flowchart for explaining processing when a resume is stopped during reproduction in the embodiment. 6 is a flowchart for explaining a resume reproduction process in the embodiment. It is a data structure diagram of video / audio / subtitles for explaining processing at the time of resume reproduction in a conventional optical disc apparatus.

Explanation of symbols

1 optical disc 11 audio coder 13 sub picture decoder 15 video decoder 20 display device 22 system controller 23 flash ROM (memory)
221 Resume stop related information storage unit 222 Resume stop related information acquisition unit 223 Subtitle display period determination unit 224 Subtitle address search unit 225 Read subtitle data read unit 226 Subtitle decode control unit 227 Subtitle display time calculation unit 228 Video / audio decode control unit 229 Display Control means

Claims (4)

In an optical disc apparatus for reproducing information recorded on an optical disc or recording / reproducing information on an optical disc,
When playback is stopped while information on an optical disc in which information including video data, audio data, and caption data is recorded, resume stop related information including resume stop address information and caption management information is stored in memory. Resume stop related information storage means for storing,
Resume stop related information acquisition means for acquiring resume stop related information including resume stop address information and subtitle management information from the memory when a resume playback command is received after the resume is stopped;
Subtitle display period determining means for determining whether or not the state when resume playback is in the subtitle display period;
When it is determined that the subtitle display period is in effect, the subtitle display start address is searched and subtitle display processing is performed. When it is determined that the subtitle display period is not in effect, the previous subtitle data is recorded. Subtitle address search means for searching for a subtitle address,
Subtitle data reading means for setting the searched subtitle address as a subtitle display start address and reading out the previous subtitle data from the subtitle display start address;
Subtitle decoding control means for performing control to decode the read previous subtitle data by a decoder;
The subtitle display time of the previous subtitle data, the subtitle address where the subtitle data of the next subtitle is displayed, and resume playback so that the previous subtitle does not overlap with the next subtitle displayed. Subtitle display time calculation means for calculating based on the playback time between the resume address indicating the position;
Video / audio decoding control means for controlling the video data and audio data at the actual resume reproduction position corresponding to the address indicated by the resume stop address information from the memory to be decoded by the decoder;
A display controller configured to synchronize the decoded video data with the decoded previous subtitle data and display video / audio / subtitle on a display device; Optical disk device to perform. In an optical disc apparatus for reproducing information recorded on an optical disc or recording / reproducing information on an optical disc,
If there is no subtitle data at the position where resume is stopped, the subtitle address where the previous subtitle data is recorded is searched when resume playback is performed, and this subtitle address is used as the subtitle display start address. An optical disc apparatus comprising a system controller that performs control for displaying subtitles based on the subtitle data on a display device.   When the system controller resumes playback when reproducing information on an optical disc on which information including video data, audio data, and caption data is being played back, the system controller stops resume including resume stop address information and caption management information. Resume stop related information storage means for storing related information in a memory, and when a resume playback command is received after the resume is stopped, resume stop related information including resume stop address information and subtitle management information is acquired from the memory Resuming stop related information acquisition means, subtitle display period determining means for determining whether or not the resume playback state is in a subtitle display period, and subtitles when it is determined that the subtitle display period is in effect Subtitle display processing is performed by searching for the display start address. When it is determined that the subtitle data is not in the middle, subtitle address search means for searching for the subtitle address in which the previous subtitle data is recorded, and the searched subtitle address is set as a subtitle display start address. Subtitle data reading means for reading the previous subtitle data, subtitle decoding control means for controlling the read previous subtitle data to be decoded by a decoder, and the previous subtitle displayed next Subtitle display time calculating means for calculating a subtitle display time based on the previous subtitle data so as not to overlap with a subtitle to be played, and an actual resume reproduction position corresponding to the address indicated by the resume stop address information from the memory Video / audio decoding control means for controlling video data and audio data to be read out and decoded by a decoder 3. The display control unit according to claim 2, further comprising display control means for synchronizing the decoded video data and the decoded previous subtitle data and displaying video / audio / subtitle on a display device. The optical disk device described.   The subtitle display time calculation means calculates a subtitle display time based on the previous subtitle data so that the previous subtitle does not overlap with a next subtitle displayed. 4. The optical disc apparatus according to claim 3, wherein the calculation is performed based on a reproduction time between a subtitle address having a character string and a resume address indicating a resume reproduction position.

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